Chables starobinetz



No Drawing.

UNlTED STATES, PATENT OFFICE.

' CHARLES STAROBINETZ," F JACKSONVILLE, FLORIDA, *ASSIGNOR 01E ONE-HALF TO I BARKING CHEMICALS COMPANY,

LIMITED, or LONDON, ENGLAND.

SULFUR DYE.

To all whom it may concern:

in the county of Duval and State of Florida, have invented certain new and useful 'Improvem'entsin Sulfur Dyes; and I do hereby declare the following .to be a full, clear, and exact description of the same.

This invention relates to an improved the class known-as sulfur colors. I have discoveredjthat a sulfur brown dye may be made by heating together sodium sul-- fid, sulfur and the oilyresidue obtained in the process of --purificati0n off trinitrotoluol by means of alcohol. I This residue consists of a mixture toluol.

Practical commercial operation of the in ventionih'as demonstrated that it may beibest carried into efiect as. follows, although 0on5 siderable variation in temperature, proportions and order in -which additions are made,

etc., isf-permissible, but are not recommended.

'Ifwo'hundred and (250) parts of sodium sulfid, concentrated, are dissolved in two hundred" (200) parts of'water. After all the sodium sulfid is dissolved one hundred and ten parts of sulfur are add-' t ed to the melt' and the mixture'heated until all the sulfur dissolves. One hundred and twenty-five parts of the 'oily residue obtained in the process of purification of trinitrotoluol by means of alcohol is then and powdered in which 'form it is a commer;;

Specification of Letters Patent. Application filed August 8, 1918. Serial No. 248,875.

v a cial product, ready Be it known that I, CHARLES S'rARoBmE'rz, a citizen of Russia, residing'at'Ja'cksonville,,

nitrotoluenes.

of various nitro derivatives: of

" metal sulfid and sulfur, the bi imothl Sl1 added gradually with constant mixmgand f the temperature is brought to about def'.

Patented Oct. '7, 1919.

for use in coloring fiber and cotton, for example, a fast shade of;

brown, from a sodium sulfid bath;

The residue referred to and the use of which is recommended, is a known product mation after distilling o trinitrotoluol and contains various nitrated derivatlves otf toluol, notably .diand tri- What I claim is:

1. The process of making a brown sulfur J dye which comprises heating with alkali metal sulfid and sulfur, the oily residue sep- 'arated from trinitrotoluol, during the purification of the latter by recrys tallization 4 from alcohol, which residue contains-various nitratedderivatives of toluol.

2. The herein described brown sulfur dye containin ,the reactions ,products-of alkali: metal su d, sulfur and the oily residue oha tained in the purification of-trinitrotoluolvarious nitrated de- 65' 3. The process ofmaking a-brown sulfur which residue contains rivatives of toluol.

dye which compriseshatin with alkali 'arated ifrom trinitrotoluene,"'duringithe pur1-,

residue sepi;

from alcohol, whichresidue contains various diand tri-nitr'otoluenes;

containin? d, sulfur'f jand the any residue i ob'tained the purification: of' trinitroto1 j nitrotoluene's ,lu'ene which residuecoutains various usually obtained ac'cordinigtopresent infor- Y the alcohol from the mother liquor obtained in recrystallizing 'fication' of the latterby recrystallization 79 

